H4H, I think that we all are feeling the same thing. When the W is around, you'd never know that we've had M problems. We're just friendly like we've known each other all of our lives. After hearing from her sister that my W has no guilt about it and she thinks that what she's doing is the right thing for her. She has no concern about what the kids are going to feel.
So I feel like the fight is a fight that I'm fighting alone and quietly. That my W somehow is liberated by the fact that I have a separate life from her. My W is not normal; so I don't know if she responds to my DB changes like a "normal" spouse. IOW, because of my W's "other man attention" seeking of the last three years; I think there's no amount of DB'ing that may bring her back. Even when things were good between us, she still sought out the attention of other men.
So I wonder what am I fighting for other than for me? So that's my answer, I'm fighting for me. Maybe the W and I are better off without each other. I know emotionally and financially, I am better off without her. She hasn't changed anything in the way she operates, financially she still can't pay her bills. She's fighting to keep her cell phone on and she has barely been through one billing cycle.
I guess in all my rambling, I'm trying to say that you are not alone in your struggle. We struggle with you and you're feelings are normal.